Java Android MapController使我的应用程序崩溃
我正在创建mapView活动,由于某些原因,此代码不起作用:Java Android MapController使我的应用程序崩溃,java,android,eclipse,google-maps,Java,Android,Eclipse,Google Maps,我正在创建mapView活动,由于某些原因,此代码不起作用: @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); this.setContentView(R.layout.map_view); MapView mapView = (MapView)this.findViewById(R.layout.map_view); Map
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
this.setContentView(R.layout.map_view);
MapView mapView = (MapView)this.findViewById(R.layout.map_view);
MapController mapController = mapView.getController();
这一行导致应用程序崩溃:
MapController mapController = mapView.getController();
当我将该行取出时,应用程序会正常工作,但当我将其放入时,它会在我启动活动时崩溃,并显示错误消息:
07-05 21:27:24.857: E/AndroidRuntime(23801): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.uie.top25.seattle/com.uie.top25.seattle.MapDetailActivity}: java.lang.NullPointerException
以下是我对mapView的调用:
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.setContentView(R.layout.detail);
Bundle bundle = this.getIntent().getExtras();
ListData listdata = bundle.getParcelable("uie.top25.seattle.listdata");
// int itemId = this.getIntent().getIntExtra(DiningActivity.ITEM_ID, -1);
String itemTitle = listdata.getTitle();
int itemNum = listdata.getItem();
String sHead = listdata.getSubhead();
String dText = listdata.getDetailText();
final float latitude = listdata.getLatitude();
final float longitude = listdata.getLongitude();
Log.i(TAG, "Title that is set : " + itemTitle);
Log.i(TAG, "Item Number that is set : " + itemNum);
Log.i(TAG, "Latitude that is set : " + latitude);
Log.i(TAG, "Longitude that is set : " + longitude);
if (itemNum >= 0)
{
TextView tView = (TextView) this.findViewById(R.id.textTitle);
tView.setText(itemTitle);
TextView nView = (TextView) this.findViewById(R.id.itemNumber);
nView.setText("" + itemNum);
TextView subHead = (TextView) this.findViewById(R.id.textSubheader);
subHead.setText(sHead);
TextView details = (TextView) this.findViewById(R.id.itemDescription);
details.setText(dText);
ImageButton mapButton = (ImageButton) this.findViewById(R.id.mapButton);
mapButton.setOnClickListener(new View.OnClickListener() {
//this is where I call my mapView from
@Override
public void onClick(View v)
{
Intent mapIntent = new Intent(DetailActivity.this, MapDetailActivity.class);
//mapIntent.putExtra("uie.top25.seattle.listlat", latitude);
//mapIntent.putExtra("uie.top25.seattle.longitude", longitude);
startActivity(mapIntent);
}
});
}
}
}
谁能告诉我我做错了什么 问题出在这一行
MapView mapView = (MapView)this.findViewById(R.layout.map_view);
您正在使用Linding LayoutmapView
无法初始化,请尝试使用ID进行更改,即
MapView mapView = (MapView)this.findViewById(R.id.map_view);
问题就在这方面
MapView mapView = (MapView)this.findViewById(R.layout.map_view);
您正在使用Linding LayoutmapView
无法初始化,请尝试使用ID进行更改,即
MapView mapView = (MapView)this.findViewById(R.id.map_view);
你能试着换一下这一行吗
MapView mapView = (MapView)this.findViewById(R.layout.map_view);
关于这一点:
MapView mapView = (MapView)this.findViewById(R.id.<your mapView Id>);
MapView MapView=(MapView)this.findViewById(R.id.);
您能试着更换这一行吗:
MapView mapView = (MapView)this.findViewById(R.layout.map_view);
关于这一点:
MapView mapView = (MapView)this.findViewById(R.id.<your mapView Id>);
MapView MapView=(MapView)this.findViewById(R.id.);
谢谢!真不敢相信我错过了!非常感谢。真不敢相信我错过了!